174 ❯ STEP 4. Review the Knowledge You Need to Score High
❯ Review Questions
- Which of the following is nota time when most
stomata tend to be open?
A. When CO 2 concentrations are low inside
the leaf
B. When temperatures are low
C. When the concentration of water inside the
plant is low
D. During the day
E. On a cold, rainy day
For questions 2–5, please use the following answer
choices:
A. Abscisic acid
B. Auxin
C. Cytokinins
D. Ethylene
E. Gibberellins- This hormone is used by supermarkets for its
“fountain of youth” effect. - This hormone initiates fruit ripening and works
hard during the autumn months. - This hormone prevents seeds from germinating
prematurely. - This hormone is known to induce growth in
dormant seeds, buds, and flowers. - A vine is observed to wrap around a tree as it
grows in the forest. This is an example of
A. gravitropism.
B. phototropism.
C. thigmotropism.
D. photoperiodism.
E. phototaxis.
7. This portion of the root of a plant is responsible
for the visual perception of growth:
A. Zone of cell division
B. Vascular cylinder
C. Zone of elongation
D. Endodermis
E. Zone of maturation
For questions 8–10, please use the following answers:
A. Sieve-tube elements
B. Vessel elements
C. Tracheids
D. Guard cells
E. Collenchyma cells
8. These cells are responsible for controlling the
opening and closing of the stomata.
9. These cells are the more efficient of the two types
of xylem cells.
10.These cells are live cells that function as struc-
tural support for a plant.
11.The unequal growth of the stem of a plant in
which the side in the shade grows faster than the
side in the sun is an example of
A. gravitropism.
B. phototropism.
C. thigmotropism.
D. photoperiodism.
E. phototaxis.